[GLLUG] Broadband signal to noise ratio
chrisbell at chrisbell.org.uk
Fri Sep 15 20:26:41 UTC 2017
I have a basic FTTC broadband and have noticed that both up and down
attenuation figures have remained constant but the signal to noise ratio drops
significantly when the ground is dry, although it soon recovers when the ground
is wet. Is this to be expected? The overall speed reaches the specified cap at
just under 40Mbps, but with many errors logged by the modem, although I do not
see errors in the final downloads.
I assume this is due to general radiation such as mobile phone transmission.
When the original lead covered cable was replaced many years ago the engineer
managed to find and re-use the rusty remains of the original iron pipe laying
on the ground and feed the new plastic coated cable through it, but it was
already too short to reach the house. I believe the first phone was installed
when the house was built in 1933, and there was no requirement for the cable
to be laid in a straight line or buried, so it was routed round the small
The direct route for a new BT plastic duct from the pavement manhole at the
correct depth would be under crazy paving for much of the way, although not
close to any other services.
Thanks for any information.
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